The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø80mm bore, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-40S is an 80 mm bore, double-acting, single-rod pneumatic cylinder with a 300 mm nominal stroke and a 40 mm rear adjustable stroke range. This design lets you fine-tune the stroke end position on the machine without swapping the cylinder, making it ideal for commissioning and format changeovers. It delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa, using a 25 mm diameter piston rod for robust linear motion.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for reliable end-of-stroke position sensing. The body length A(SCJ) is 239 mm, and the cylinder features an adjustable air cushion (28 mm length) to decelerate the piston smoothly. It uses PT1/8 ports and an M20x1.5 rod thread, operating on filtered air from 0.15 to 1.0 MPa.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 28 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -40 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
The 40 mm adjustable stroke allows engineers to precisely dial in the end-stop position during initial machine setup, accommodating stack-up tolerances without machining custom spacers or stops.
On packaging lines, quickly adjust the cylinder's stroke end to handle different box or product sizes. The 300 mm stroke and 40 mm fine-tuning range provide flexibility for multiple SKUs on one machine.
In high-cycle clamping or pressing fixtures, use the rear adjusting screw to take up mechanical wear on tooling or contact surfaces, maintaining consistent clamp force without replacing the actuator.
For applications needing less force, consider stepping down to the 63 mm bore SCJ, which provides 1559 N of push force at 0.5 MPa. If your load requires more power, the 100 mm bore SCJ offers 3927 N at the same pressure. Because this is a 300 mm stroke cylinder, be mindful of side-loading on the rod; if the load is not perfectly guided, use an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
When replacing an existing unit, match the 80 mm bore, the 300 mm nominal stroke, and the 40 mm adjustable range. This model has a built-in magnet for sensors, a basic mount (no bracket), a TPU seal, and PT port threads. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion accessories (part codes like F-SC80FA) if a bracket is needed later.
Adjustable-stroke checklist
The push force is 2513 N at 0.5 MPa and 4523 N at 0.9 MPa. The pull force is lower due to the single 25 mm rod subtracting area, providing 2268 N at 0.5 MPa. The rear adjusting screw does not change the force output; it only sets the stroke end position.
Yes, if you need the 40 mm field-adjustable stroke feature. The SCJ80X300-40S shares the same bore, rod, and port configuration as the SC80 but is slightly longer due to the adjusting mechanism. Ensure your mounting space accommodates the 239 mm body length and that you match the PT port thread and magnet option.
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